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Leases - Right of use assets (Details)	Jun. 30, 2019 USD ($)
Intercompany balances
Right of use assets, net of amortization	$ 15,467,645

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- References

No definition available.

+ Details

Name:	GRST_LeasesDetailsAbstract
Namespace Prefix:	GRST_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	GRST_RightOfUseAssetsNetOfAmortization
Namespace Prefix:	GRST_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant